A "hipster-groupie" is a sole individual that lives, eats, and breathes the "hipster" style of life. Extensive research has shown that it is usually an employer/employee relationship, with said employer typically failing to understand meaning of "work-place boundaries." "Hipster groupies" can also be identified as the more casual, street-slang term "Buddy Holly fanatics." Between the two titles, it comes down to whichever you'd prefer to include in your colloquial.